Development guide

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http://code.google.com/chrome/apps/docs/developers_guide.html

Developer's Guide - Installable Web Apps - Google Code

Read this page to learn how to create and load a hosted app —a regular web app, plus some metadata. If you're interested in creating a packaged app —a web app that's bundled up as an extension, so that the user downloads all of its content—see Packaged Apps in the extensions documentation . Contents Creating hosted apps A hosted app requires a .crx file that contains metadata describing the app. (The .crx file format is just a variation of ZIP that's used by Google Chrome.)
https://developers.google.com/chrome/web-store/docs/#webstore

Overview - Chrome Web Store - Google Code

The Chrome Web Store lets you publish apps where Google Chrome users can easily find them. The store's primary purpose is to help Chrome users find apps.